Xie Wanxing, a talented jewelry designer who returned from overseas, returned to China to fulfill his grandmother's last wish and find out the culprit who killed his grandfather and took away the precious treasure "Lost Heart". He concealed his identity and, by a twist of fate, mistook jewelry tycoon Lu Haochen for his best friend's boyfriend. He impulsively disrupted the other party's blind date and unexpectedly learned that Lu Haochen was an employee of the Lu jewelry company. In order to make up for his mistake and obtain more information about the "Lost Heart", Xie Wanxing and Lu Haochen obtained a certificate and began living together. At this point, both parties were not familiar with each other and were wary of each other. They hid their skin together, with one being a high-end luxury brand jewelry tycoon to the outside world, and the other being a social worker who often travels from nine to five. The other was a mysterious overseas genius jewelry designer who never appeared to the outside world, and the other being a company painter who was often urged to draft. The two of them began living together with their own thoughts